<mat-form-field>
  <mat-label>Pick a time</mat-label>
  <input matInput [matTimepicker]="picker">
  <mat-timepicker-toggle matIconSuffix [for]="picker">
    <mat-icon matTimepickerToggleIcon>keyboard_arrow_down</mat-icon>
  </mat-timepicker-toggle>
  <mat-timepicker #picker/>
</mat-form-field>
